Honda Accord 2.2 Problem Model 1994

Colleagues and friends, I'm writing to you because I have a problem with a 1994 Honda Accord 2.2. The CO reading is very high, and I thought it was the oxygen sensor, but I discovered it doesn't have one. It does have a CO potentiometer, but I don't know how to calibrate it. If anyone knows what I should do or how to fix this problem, I would be eternally grateful.

Thank you very much.

Double-check that it does have a lambda sensor.
If it's an F22B2 engine, it's located at the end of the exhaust manifold.
If it's an F22B5 engine, it's located just before the catalytic converter, underneath the car.

Also check the catalytic converter, as these faults are often related.